Internet Engineering Task Force (IETF) M. Cotton
Request for Comments: 6890 L. Vegoda
BCP: 153 ICANN
Obsoletes: 4773, 5156, 5735, 5736 R. Bonica, Ed.
Category: Best Current Practice Juniper Networks
ISSN: 2070-1721 B. Haberman
JHU
April 2013
Special-Purpose IP Address Registries
Abstract
This memo reiterates the assignment of an IPv4 address block
(192.0.0.0/24) to IANA. It also instructs IANA to restructure its
IPv4 and IPv6 Special-Purpose Address Registries. Upon
restructuring, the aforementioned registries will record all special-
purpose address blocks, maintaining a common set of information
regarding each address block.
This memo obsoletes RFCs 4773, 5156, 5735, and 5736.
Status of This Memo
This memo documents an Internet Best Current Practice.
This document is a product of the Internet Engineering Task Force
(IETF). It represents the consensus of the IETF community. It has
received public review and has been approved for publication by the
Internet Engineering Steering Group (IESG). Further information on
BCPs is available in Section 2 of RFC 5741.
Information about the current status of this document, any errata,
and how to provide feedback on it may be obtained at
http://www.rfc-editor.org/info/rfc6890.
Cotton, et al. Best Current Practice [Page 1]RFC 6890 Special-Purpose Address Registries April 2013Copyright Notice
Copyright (c) 2013 IETF Trust and the persons identified as the
document authors. All rights reserved.
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Table of Contents
1. Introduction ....................................................2
2. IANA Considerations .............................................3
2.1. Assignment of an IPv4 Address Block to IANA ................3
2.2. Restructuring of the IPv4 and IPv6 Special-Purpose
Address ....................................................4
2.2.1. Information Requirements ............................4
2.2.2. IPv4 Special-Purpose Address Registry Entries .......6
2.2.3. IPv6 Special-Purpose Address Registry Entries ......14
3. Security Considerations ........................................20
4. Acknowledgements ...............................................20
5. Informative References .........................................20
1. Introduction
In order to support new protocols and practices, the IETF
occasionally reserves an address block for a special purpose. For
example, [RFC1122] reserves an IPv4 address block (0.0.0.0/8) to
represent the local (i.e., "this") network. Likewise, [RFC4291]
reserves an IPv6 address block (fe80::/10) to represent link-scoped
unicast addresses.
Periodically, the IETF publishes an RFC that catalogs special-purpose
address blocks. Currently, [RFC5735] catalogs all IPv4 special-
purpose address blocks and [RFC5156] catalogs all IPv6 special-
purpose address blocks.
[RFC5736] assigns an IPv4 address block (192.0.0.0/24) to IANA and
instructs IANA to allocate special-purpose address blocks from this
space. [RFC5736] also instructs IANA to create an IPv4 Special-
Purpose Address Registry that records allocations from this address
Cotton, et al. Best Current Practice [Page 2]RFC 6890 Special-Purpose Address Registries April 2013
space. However, [RFC5736] does not instruct IANA to record special-
purpose address block reservations from outside of the aforementioned
space in the IPv4 Special-Purpose Address Registry.
Likewise, [RFC2928] assigns an IPv6 address block (2001:0000::/23) to
IANA and instructs IANA to allocate special-purpose address blocks
from this space. [RFC4773] instructs IANA to create an IPv6 Special-
Purpose Address Registry that records allocations from this address
space. However, [RFC4773] does not instruct IANA to record special-
purpose address block reservations from outside of the aforementioned